Hypodermic syringe.



No. 728.160 BATBNTBD'MAY 12,1903.

u T. A. GHAPPELL HYPODERMIG SYRINGE.

APPLIGATION FILED 001:31.. 1903.-

NO MODEL.

' ATTORNEY Patented May 12, 1903.

ATENT Finca.

THOMAS ANDREW OHAPPELL, OF BRONWOOD, GEORGIA.

HYPODERMIC SYRINGE.

SPECIFICATION forming part of Letters Patent No. 728,160, dated May 12, 1903.

origina] application nea Mtyiauasrai110.107.391?

To @ZZ whom t may concern.-

Be it known that I, THoMAs ANDREW CHAP- PELL, a citizen of the United States, and a.,

the following is a full, clear, and exact descrip` tion, this being a division of ,the` applicatiom for Letters Patent for a hypodermic 'syringe filed by me on thelth day of'May, 1902, Se-

rial No. 107,397, and patented March 17 ,1903,Y

washer 18 has bearing, and a ball 19, of rub- The purpose of my invention is to provide a hypodermic syringe with an fexpansible plunger-head and means for expandingthe said head and relieving it frompressure, which means is located at the outer end of the plunger-rod.

Another purpose of the invention is to so construct the syringe that it may be charged from the side, and whereby when a tablet is introduced into the syringe it will be pressed by the plunger-head at its inward movement against an anvil-surface within the body of the syringe, thus causing the tablet to be crushed, permitting it to quickly dissolve.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure lis a perspective View of the syringe, drawn upon an enlarged scale. Fig. 2 is a longitudinal section through the syringe, drawn on the same scale; and Fig. 3 is a 1ongitudinal sectional view of the head end of the plunger.

A represents the barrel of the syringe, which needle 13 is screwed or otherwise fastened,v and at the outer end of the chamber of theY barrel A a flat or anvil surface 14 is formed,

.shown in Fig. 2. .y The plungerB'is'off peculiar construction,

Divided and this application filed October 31, 1902. Serial (Nemodel.) A. v

against which a tablet, for example, may be pressed and crushed by the head of the plunger moving in the barrel, and the chamber of the barrel A is connected with the hub portion of the needle by the usual channel 15, extending throughthe nose 11 of the barrel and into'the said'barrel-chamber, as is best andv consists of .a plunger-rod 16, having a head 17 at its outer end, against which a ber, is mounted on the said plunger-rod 16, having bearing against the washer 18, and said vball 19 constitutes the plunger-head.

ing 2O is screwed or otherwise preferably removably secured, and the plunger-rod-l passes out through and beyond the said bushing, being provided at its outer end with a thread, and on the threaded surface of said plunger-rod a nut 21 is screwed. This nut has bearing against the outer end of a tube 22, which is fitted around the plunger-rod 16, as is shown in Figs. 2 and 3, and the said tube extends to the head or ball 19. The said head or ball is engaged by an annular flange 23, formed at the inner end of the said tube. It is evident that by screwing the nut 21 in direction f the barrel A the tube 22 will be forced forward or in direction of the needle end of the barrel and the elastic head will be placed under more or less compression and caused to hug the inner surface of the barrel-chamber more or less tightly and that by moving the nut 21 in the opposite direction the said plunger-head will be `relieved from pressure, enabling the plunger in its entirety to be readily withdrawn from the barrel A when the bushing 20 has been removed. A 1

When the syringe vis toreceive a charge, it is drawn outward-frein' the`cas'e24 atits handle end a sufficient distanceato expose the charge-opening 1Q in-the'pjbarrel A, and even while the syringe yet remains in the case the case and syringe may be moved to the' right or to the left to bring the charge-opening 10 of the syringe beneath any receptacle containing the desired charge.

Having thus described my invention, I

At the handle end of the barrel A a bushclaim as neW and desire to secure by Letters Patent- 1. In a hypodermie syringe, a barrel having near its handle end an opening of a size to permit the insertion of a tablet into the barrel and an anvil-surface at the needle end thereof, and a plunger in the said barrel and having a Hat head beyond the plunger-head,

as and for the purpose set forh.

2, A syringe, comprsinga barrel having an internal anvil-surface at the needle end thereof and provided with an enlarged opening in its side adjacent to its upper or handle end,

and a plunger in the barrel, whereby when the plunger is drawn out beyond the opening of the barrel a tablet' may be inserted into said barrel and crushed upon the anvil-surface Ihereo by means of the plunger, as set forth.

In testimony whereof I have signed my name to this specioabion in the presence of two subscribing Witnesses.

THOMAS ANDREW CI-IAPPELL.

Vitnesses:

H. A. WILKINSON, W. S. DOZIER. 

